javascript - 排队任务中出现异常 : TypeError: Cannot read property 'length' of null

Question

下面的代码假设连接许多对象的content属性的文本(没有html):

var chapters = Chapters.find({
  bookId: this._id
}).fetch();
// => [Object, Object, Object]

var chapterContent = function() {
  var results = [];
  for (i = 0, len = chapters.length; i < len; i++) {
    var chapter = chapters[i];
    results.push(chapter.content.replace(/(<([^>]+)>)/ig, ""));
  }
  return results;
});
// => ["srtrt", "fffff", "ggggg"] 


var chapterContentWords = chapterContent.join(" ");
// => srtrt fffff ggggg 

var chapterContentWordsNumber = chapterContentWords.match(/[\w-]+/g).length;

但是在最后一部分(它应该返回单词数)，我收到以下错误:

Exception in queued task: TypeError: Cannot read property 'length' of null

我做错了什么？

Answer 1

要获取单词数，您可以执行以下操作:

var chapterContentWordsNumber = chapterContentWords.split(" ").length;

或者简单地说:

var chapterContentWordsNumber = chapterContent.length;